// filter by date
var A = ee.FeatureCollection();
var subset_A = A.filterDate(start,end)

// filter by region
var subset_A = A.filterBounds(geometry)

// filter by values
// methods:
//  1. ee.Filter.or
//  2. ee.Filter.and
//  3. ee.Filter.eq
//  4. ee.Filter.lte little or equal
//  5. ee.Filter.inList

// filter feature by value == 11
var subset_A = A.filter(ee.Filter.eq("value",11))

var subset_A = A.filter(ee.Filter.notNull())